Re:Introducing E2, new cost-optimized general purpose VMs fo...
by AaronFriel on Wednesday December 11, 2019 @01:46PM
(#21765464)
Linux and Windows have both supported it, but use tends to be at the fringes on mainframe/datacenter machines that are validated for it and so those paths aren't tested on a very wide variety of hardware and running applications. And adding CPUs and memory is one thing but removing is another.
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Re:Introducing E2, new cost-optimized general purpose VMs fo...
by kllrnohj on Wednesday December 11, 2019 @08:07PM
(#21768448)
CPU cores being hotplugged on & off was actually super common for a few years, and still is in a lot more devices than you'd expect.
It used to be a corner stone of power management on mobile devices. The Nexus 5, for example, would regularly run with just a single core online, hotplugging the other 3 off until hit with a load and then brought cores back online 1 by 1 as needed.
That behavior still is in some corners of the mobile world, but increasingly less so.
So the CPU hotplug path is as a result actually a lot more battle hardened than you'd expect, and a lot more consumer software than you'd think ran just fine in that setup without noticing.